Hearing Loss and Dementia: What the Latest Research Tells Us
16 minute read
16 minute read
If you have noticed that conversations are becoming harder to follow, the television volume is creeping up or you increasingly ask people to repeat themselves, it may be tempting to dismiss it as a normal part of ageing.
But hearing health deserves more attention than that.
A growing body of research has found a consistent association between hearing loss and dementia, particularly when hearing loss develops in mid-life or later life and remains unmanaged.
That does not mean hearing loss causes dementia in every person.
It also does not mean that wearing hearing aids guarantees dementia prevention.
What the evidence does suggest is that hearing loss is an important, potentially modifiable risk factor for cognitive decline, and that identifying and managing hearing problems earlier may be beneficial for both day-to-day communication and wider brain health.
At Ear Wax Removal Clinic, we provide ear wax removal, hearing assessments and hearing-aid services across Surrey, Berkshire, Hampshire and London. We currently offer free hearing tests for people aged over 50 at selected clinics.
So what does the latest research actually show?
Yes, there is now substantial evidence of an association.
One of the most comprehensive reviews to date analysed 50 cohort studies involving more than 1.5 million people.
It found that adult-onset hearing loss was associated with:
The researchers also found a dose-response relationship. For every 10-decibel worsening in hearing, dementia risk increased by around 16%.
That matters because hearing loss is not simply an all-or-nothing condition.
Even relatively modest deterioration may be relevant.
A separate 2025 global systematic review also found that hearing loss was associated with an increased risk of dementia across different continents, supporting the consistency of the association internationally.
The 2024 Lancet Commission on dementia prevention, intervention and care identified 14 potentially modifiable risk factors for dementia.
Hearing loss was one of them.
The Commission’s broader message is important:
Dementia is not always preventable, but a significant proportion of cases may potentially be delayed or reduced by addressing modifiable risk factors throughout life.
These include:
Alzheimer’s Society reports that evidence suggests addressing these factors could potentially prevent or delay nearly half of dementia cases at population level.
That does not mean hearing loss alone accounts for half of dementia.
It means hearing should be considered alongside the wider picture of cardiovascular, social and lifestyle health.
Researchers are still working to understand the exact mechanisms.
Several explanations have been proposed.
When hearing becomes less clear, the brain may need to devote more effort to simply decoding what someone is saying.
This is sometimes described as increased cognitive load.
Instead of effortlessly understanding conversation, the brain may have to work harder to fill in missing sounds, interpret speech and separate voices from background noise.
Over long periods, this additional demand may affect how cognitive resources are used.
Imagine finding it difficult to hear in:
Some people gradually start avoiding these situations.
That can lead to less social interaction.
This matters because social isolation itself is also associated with an increased risk of dementia.
Hearing loss may therefore contribute indirectly by making social engagement more difficult.
The auditory system involves more than the ears.
Large areas of the brain are involved in processing, interpreting and making sense of sound.
Some studies have found associations between hearing loss and changes in brain structure, although researchers are still trying to determine exactly what is cause, effect or shared ageing-related change.
A 2026 umbrella review concluded that adult hearing loss is significantly associated with increased risks of cognitive impairment, dementia and Alzheimer’s disease, but also cautioned that much of the evidence remains observational and should not automatically be interpreted as proof of direct causation.
That distinction is critical.
We cannot say that definitively.
Most of the research demonstrates an association, not absolute proof that hearing loss directly causes dementia.
There are several possibilities:
Alzheimer’s Society specifically notes that hearing changes may be both a risk factor and, in some situations, an early feature of neurological change.
So the correct message is:
Hearing loss increases risk. It does not make dementia inevitable.
The large 2024 systematic review is particularly important because it included only studies in which participants did not have dementia at the beginning.
Researchers then followed them for at least two years.
Across 1,548,754 participants, hearing loss was associated with increased subsequent risk of:
| Outcome | Increased risk associated with hearing loss |
| Dementia | 35% |
| Mild cognitive impairment | 29% |
| Cognitive decline | 29% |
| Alzheimer’s disease dementia | 56% |
The study also found that each 10 dB deterioration in hearing was associated with approximately a 16% increase in dementia risk.
The finding strengthens the argument for identifying hearing loss before it becomes severe.
This is where the research becomes more interesting, but also where claims need to be careful.
Several observational studies suggest that people with hearing loss who use hearing aids may have better cognitive outcomes than people whose hearing loss remains untreated.
A JAMA Neurology systematic review and meta-analysis involving 137,484 participants found that hearing-device use was associated with a 19% lower hazard of long-term cognitive decline.
Another large Danish cohort study followed more than 573,000 people.
It found that people with hearing loss who were not using hearing aids had a higher dementia risk than those with hearing loss who were using them.
These results are encouraging.
However, observational studies cannot completely prove that hearing aids themselves caused the difference.
People who use hearing aids may also differ in other important ways, including health behaviours, access to healthcare and social engagement.
The ACHIEVE trial is particularly important because it was a randomised controlled trial rather than an observational study.
It studied 977 adults aged 70 to 84 with untreated hearing loss and no substantial cognitive impairment.
Across the whole study population, hearing intervention did not significantly slow cognitive decline over three years.
However, among the subgroup already at greater risk of cognitive decline, hearing intervention slowed cognitive decline by approximately 48%.
Later analysis suggested the benefit was greatest among participants at the highest predicted risk of cognitive decline. PubMed Central (PMC)
This is an important nuance.
It would therefore be misleading to say:
“Hearing aids prevent dementia.”
The stronger and more defensible statement is:
Hearing treatment may help protect cognitive function in some higher-risk older adults, but more research is still needed to establish exactly who benefits and by how much.
A 2026 umbrella review reached essentially the same conclusion. Hearing interventions may be associated with reduced cognitive decline, but the size and causality of the effect are still being established.
One of the most important findings from dementia-prevention research is that we should not wait until very old age to think about hearing.
Alzheimer’s Society highlights mid-life, approximately ages 40 to 65, as a particularly important period.
Hearing problems developing during this period are associated with increased dementia risk later in life.
This makes early hearing assessment useful even when you feel that your hearing loss is “not bad enough yet”.
You may not realise how much hearing has changed because age-related hearing loss often develops gradually.
Hearing deterioration can be subtle.
You may not suddenly wake up unable to hear.
Instead, you may gradually begin to:
Because the change is gradual, friends and family sometimes notice the problem first.
Alzheimer’s Society research published in August 2026 found that 40% of people over 40 said their hearing had worsened over the previous five years, but only 33% had undergone a hearing check during that period.
That gap is precisely why routine hearing assessment matters.
Yes.
Hearing loss does not always mean permanent age-related deterioration.
A build-up of ear wax can block the ear canal and cause temporary conductive hearing loss.
Symptoms can include:
This is particularly relevant before interpreting a hearing test.
If significant wax is blocking the ear canal, it may need to be removed before an accurate hearing assessment can be completed.
However, one distinction is important:
There is no evidence that ear wax itself causes dementia.
The dementia research relates primarily to persistent hearing impairment.
The value of identifying wax is that some apparent hearing loss may be reversible.
If you are over 50, regular hearing assessment is sensible.
Hearing loss often progresses gradually and can be present before it becomes obvious in everyday life.
A hearing assessment can establish:
Even if your hearing is normal, you have established a useful baseline for future comparison.
At Ear Wax Removal Clinic, we offer free hearing tests for people aged over 50 at selected locations.
Our hearing services include:
The clinic currently lists hearing assessments and free over-50 hearing tests at locations including:
Our wider ear wax removal network also includes clinics in Reigate, Hampton, Putney and Surbiton.
A hearing assessment is designed to establish how well you hear different sounds and frequencies.
Depending on the assessment, this may include:
If hearing loss is identified, the clinician can explain whether hearing aids or further medical assessment may be appropriate.
Keep using them as recommended.
Hearing aids only help when they are worn and working properly.
Problems can arise when:
If your hearing seems to have changed despite wearing hearing aids, arrange a hearing review rather than simply increasing the volume yourself.
Modern hearing aids are not simply amplifiers.
Depending on the model and hearing profile, they may help with:
Ear Wax Removal Clinic provides hearing-aid solutions including products from Phonak and Starkey.
The aim is not simply “making things louder”.
It is improving useful hearing and communication.
This is a particularly important issue.
Someone who does not hear a question correctly may appear to have:
These signs can overlap with symptoms seen in cognitive decline.
Alzheimer’s Society notes that hearing loss can make dementia assessment more difficult because the symptoms of the two conditions can sometimes appear similar.
That is another reason why hearing should be assessed rather than assumed.
If someone is experiencing memory or thinking problems, hearing assessment may form one useful part of a wider clinical evaluation.
Very often, yes.
Good communication helps people participate in:
Untreated hearing loss can make all of these more tiring or frustrating.
Because social isolation is itself associated with dementia risk, maintaining communication may have benefits that extend beyond hearing alone.
This is one possible mechanism behind the observed relationship between hearing treatment and cognitive health.
There is no guaranteed way to prevent dementia.
But there are practical steps that support both hearing and overall health.
Do not wait until communication becomes extremely difficult.
If hearing aids are recommended, consider using them consistently.
Do not repeatedly push cotton buds or other objects into the ear canal.
If you suspect impacted wax, seek professional assessment.
Use appropriate hearing protection around:
Continue engaging with family, friends and community activities.
High blood pressure, diabetes, obesity and high cholesterol are also recognised dementia risk factors.
A hearing test does not diagnose dementia.
If you or someone close to you is developing persistent problems with memory, thinking, language or day-to-day functioning, contact a GP.
The evidence continues to strengthen.
A 2026 umbrella review, which combined evidence from nine previous meta-analyses, concluded that adult hearing loss is significantly associated with:
The relationship appeared stronger in older adults.
Importantly, the researchers still cautioned against claiming direct causation because much of the underlying evidence is observational.
That is an important scientific distinction.
The research is strong enough to take hearing health seriously.
It is not strong enough to promise that treating hearing loss will prevent dementia.
The connection between hearing loss and dementia is now supported by a substantial body of research.
We know that:
That means the sensible response is not fear.
It is early assessment and appropriate management.
If your hearing has changed, find out why.
It could be ear wax.
It could be age-related hearing loss.
It could be another ear condition.
Whatever the cause, knowing is better than guessing.
If you are over 50 and have not had your hearing checked recently, now is a good time to establish a baseline.
Ear Wax Removal Clinic offers free hearing tests for over-50s at selected clinics, alongside professional ear wax removal and hearing-aid services.
Telephone: 0300 124 7600
Appointments are available through our network of clinics across Surrey, Berkshire, Hampshire and London.
Early action may help you hear conversations more clearly, remain socially connected and manage hearing loss appropriately.
And based on the growing evidence linking hearing health with cognitive health, that is another good reason not to ignore changes in your hearing.
Research shows a strong association between hearing loss and increased dementia risk, but it has not been conclusively proven that hearing loss directly causes dementia. Several mechanisms may contribute, including increased listening effort, reduced auditory stimulation and social isolation.
A 2024 meta-analysis of more than 1.5 million people found hearing loss was associated with a 35% higher risk of dementia overall. Every 10 dB worsening of hearing was associated with approximately a 16% increase in risk.
It is too early to say that hearing aids prevent dementia. Observational evidence suggests hearing-aid users may have lower rates of cognitive decline, while the ACHIEVE randomised trial found a significant slowing of cognitive decline in higher-risk older adults but not across the full study population.
Yes. The 2024 Lancet Commission lists hearing loss among 14 potentially modifiable risk factors for dementia.
There is no single mandatory age, but regular testing becomes increasingly useful as you get older. Mid-life hearing loss, particularly between approximately 40 and 65, has been associated with later dementia risk.
Yes. Impacted ear wax can obstruct the ear canal and temporarily reduce hearing. This is different from permanent age-related hearing loss and may improve once the wax is safely removed.
There is no evidence that ear wax itself causes dementia. The research relates to hearing impairment. However, blocked ears can affect hearing, which is why wax should be identified and treated where appropriate.
Sometimes. Difficulty following conversations or responding appropriately can result from hearing loss as well as cognitive problems. The two can also occur together. Alzheimer’s Society recommends regular hearing assessment for people with dementia.
Ear Wax Removal Clinic offers free hearing tests for people over 50 at selected clinics including Andover, Farnham, Sunningdale, Wokingham and West Byfleet.
If significant wax is obstructing the ear canal, it may affect the accuracy of the hearing assessment. The clinician can inspect your ears first and advise whether wax removal is needed.